CVE-2026-3508 Overview
CVE-2026-3508 is an out-of-bounds read vulnerability [CWE-125] in the IOCTL handler of the ASUS System Control Interface driver. A local authenticated user can submit a crafted IOCTL request that specifies a read size exceeding the underlying buffer size. The driver reads beyond the allocated bounds and triggers a kernel-mode fault, resulting in a system crash (Blue Screen of Death). The vulnerability affects availability only and does not directly disclose memory contents to user space or enable code execution. ASUS has published guidance in the Security Update for MyASUS section of the ASUS Security Advisory.
Critical Impact
A local user with low privileges can crash Windows systems running the vulnerable ASUS System Control Interface driver, disrupting availability and forcing an unplanned reboot.
Affected Products
- ASUS System Control Interface (driver component)
- MyASUS application installations bundling the vulnerable driver
- ASUS notebook and desktop systems shipped with the affected utility
Discovery Timeline
- 2026-05-08 - CVE-2026-3508 published to the National Vulnerability Database (NVD)
- 2026-05-08 - Last updated in NVD database
Technical Details for CVE-2026-3508
Vulnerability Analysis
The ASUS System Control Interface exposes a kernel-mode driver that user-space components communicate with through IOCTL (I/O Control) calls. The IOCTL handler accepts a caller-supplied size parameter that controls how many bytes the driver reads from an internal buffer. The handler does not validate that the requested read length stays within the allocated buffer.
When the requested size exceeds the buffer length, the driver dereferences memory past the buffer boundary. In kernel context, an access to an unmapped or invalid page raises a bug check, producing a Blue Screen of Death (BSOD). The flaw is reachable from a local low-privileged process because the device object is accessible to standard users.
The vulnerability is classified under [CWE-125] Out-of-bounds Read. Impact is restricted to availability — the EPSS score is 0.006% (percentile 0.399), reflecting low expected exploitation activity in the wild.
Root Cause
The root cause is missing bounds validation in the IOCTL dispatch routine. The driver trusts the size value passed through the input buffer or IOCTL parameter without comparing it against the actual size of the source buffer before performing the read operation.
Attack Vector
An attacker requires local access and a valid user session on the host. The attacker opens a handle to the driver's device object and issues DeviceIoControl with the vulnerable IOCTL code and an oversized length field. No user interaction is required after the call is issued.
No verified public proof-of-concept code is available for CVE-2026-3508. Refer to the ASUS Security Advisory for vendor-provided technical details and the affected IOCTL code.
Detection Methods for CVE-2026-3508
Indicators of Compromise
- Unexpected BSOD events on ASUS hardware referencing the System Control Interface driver in the bug check stack
- Windows Event Log entries with Event ID 41 (Kernel-Power) following abnormal shutdowns on affected systems
- Crash dump files in %SystemRoot%\Minidump\ implicating the ASUS System Control Interface driver image
Detection Strategies
- Inventory endpoints for installed versions of MyASUS and the ASUS System Control Interface driver and compare against the fixed versions listed in the vendor advisory
- Monitor for processes opening handles to the ASUS System Control Interface device object followed by DeviceIoControl calls from non-ASUS binaries
- Correlate repeated kernel bug checks across endpoints with the same driver signature to identify probing or exploitation attempts
Monitoring Recommendations
- Forward Windows kernel crash telemetry and WER reports to a centralized log platform for trend analysis
- Alert on user-mode processes that load or interact with kernel drivers outside of expected vendor utilities
- Track software inventory changes that introduce or downgrade the ASUS System Control Interface driver
How to Mitigate CVE-2026-3508
Immediate Actions Required
- Apply the security update referenced in the Security Update for MyASUS section of the ASUS Security Advisory
- Identify all systems running MyASUS or the ASUS System Control Interface and prioritize patching of shared and multi-user hosts
- Restrict local logon rights on sensitive systems to reduce the population of users able to invoke the vulnerable IOCTL
Patch Information
ASUS has issued an update for the System Control Interface component distributed through MyASUS. Customers should install the latest MyASUS release from the official ASUS download portal. Refer to the ASUS Security Advisory for the exact fixed driver version and release notes.
Workarounds
- Uninstall MyASUS and the ASUS System Control Interface on systems that do not require ASUS management features
- Disable the ASUS System Control Interface service until the patched driver can be deployed
- Enforce least privilege and remove unnecessary interactive logon rights on multi-user endpoints
# Verify installed MyASUS / ASUS System Control Interface version on Windows
Get-WmiObject Win32_PnPSignedDriver | Where-Object { $_.DeviceName -like "*ASUS System Control Interface*" } | Select-Object DeviceName, DriverVersion, DriverDate
# Stop and disable the service as a temporary workaround
sc.exe stop "AsusSystemControlInterface"
sc.exe config "AsusSystemControlInterface" start= disabled
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
